Bridge saddle, unbleached bone, 77,5x10x2,7mm, folk, 14" archedarticle number: BBS 4U product id: 45159 Boston bridge saddle, unbleached bone, 77,5x10x2,7mm, folk, 14" arched This saddle is made from unbleached bone, a long time favourite of many luthiers. The slightly self lubricating properties of unbleached bone as opposed to the very white bleached bone are a good reason to use this nut material. When polished, the looks of unbleached bone are very elegant and will add class to your guitar.